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International Heat Transfer Conference 12

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

Condensation Heat Transfer and Pressure Drops of Refrigerant R-134a in Annular Helicoidal Pipes

J. T. Han
Hemispheric Center for Environmental Technology Florida International University 10555 West Flagler Street, Miami, FL 33174 USA

Cheng-Xian Lin
Department of Mechanical and Materials Engineering Florida International University, Miami, Florida 33174, USA

M. A. Ebadian
Mechanical Engineering Department, Florida International University The State University of Florida at Miami, Miami, FL 33199, USA

DOI: 10.1615/IHTC12.2890
6 pages


Condensation heat transfer of environmental friendly refrigerant R-134a in annular helicoidal pipe is of significant importance to the effective design of helicoidal pipe heat exchangers for refrigeration and air conditioning and many other applications. This paper presents an experimental investigation on condensation heat transfer and pressure drop characteristics of R-134a in an annular helicoidal pipe. The average condensation heat transfer coefficients and pressure drops for R-134a are experimentally determined at three different saturated temperatures (35, 40, and 46°C) in an annular helicoidal pipe with the helix axial oriented in the same direction as gravity. The experimental results are compared to the test data available in the open literature for helicoidal and straight pipes.

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